Navigate to "Financials" "Data Management" in the left side menu. You'll then land on the "Accounting" tab.
If this is the first time you have uploaded accounting files, click the "Upload accounting files" button.
Click or drag and drop the files into the box to upload. Then, save by clicking on the button "Upload accounting files".
If you have uploaded accounting files and want to add more, click the "Upload accounting files" button.